Kingboard PCB materials explained by engineers, for engineers. This complete 2026 guide covers all FR-4, CEM-1, CEM-3 laminate grades (KB-6160, KB-6167, KB-616XF), surface finishes, Tg ratings, and real-world applications — with datasheets and a buyer’s selection framework.

If you’ve spent any time sourcing PCB laminates, you’ve almost certainly crossed paths with Kingboard PCB materials — probably without even realizing it. Kingboard Laminates Holdings Ltd. is one of the world’s largest copper-clad laminate (CCL) producers, and their materials quietly sit inside everything from industrial control boards to automotive ECUs to everyday consumer electronics. Yet surprisingly, a lot of engineers still pick Kingboard PCB laminates based on price alone without fully understanding what differentiates one grade from another. That’s a mistake that can cost you rework cycles and field failures down the line.

This guide breaks down the full Kingboard PCB lineup — laminate grades, surface finishes, real-world applications, and how to make the right material call for your next design.

What Is Kingboard PCB? A Quick Company Background

Kingboard Holdings Limited (SEHK: 148), formerly Kingboard Chemical Holdings, is a Hong Kong-headquartered multinational that established its first laminate manufacturing plant in Shenzhen in 1988. Today, the group operates more than 60 manufacturing facilities across China and Thailand, covering the full vertical supply chain — from glass yarn and copper foil production right through to finished printed circuit boards.

The PCB materials business is handled by Kingboard Laminates Holdings Ltd., a separately listed subsidiary that specializes in glass epoxy laminates, paper laminates, and CEM (Composite Epoxy Material) laminates. On the finished PCB side, their subsidiary Elec & Eltek International (acquired in 2004) manufactures high-density interconnect (HDI) and backplane PCBs of up to 50 layers for major global OEMs.

What makes Kingboard PCB materials a go-to for manufacturers is a combination of consistent batch quality, globally scalable supply, competitive pricing, and broad IPC/UL compliance. They aren’t a boutique material supplier — they’re a volume workhorse, and that’s exactly what most production engineers need.

Understanding Kingboard PCB Laminate Grades

This is where most engineers need to slow down and pay attention. “Kingboard PCB” isn’t a single product — it’s a family of laminate materials, each with its own resin chemistry, reinforcement system, and performance profile. Picking the wrong grade is one of the most common and avoidable root causes of PCB reliability failures.

FR-4 Kingboard PCB Laminates

FR-4 is the backbone of the Kingboard PCB lineup and the most widely used class of CCL in the industry. The designation “FR” stands for Flame Retardant, and these laminates comply with the UL94 V-0 flammability standard. The reinforcement is woven E-glass fabric impregnated with epoxy resin, giving FR-4 an excellent balance of mechanical strength, electrical insulation, and thermal performance.

Kingboard produces multiple FR-4 grades under their KB-6000 series. The most common ones you’ll encounter in fabrication are:

Kingboard Grade	Tg (°C)	Key Feature	Typical Application
KB-6160	135	Standard FR-4, IPC-4101E/21 compliant, excellent dimensional stability	Consumer electronics, industrial PCBs, 4–8 layer boards
KB-6160C	135	Lead-free assembly compatible	RoHS-compliant products requiring lead-free soldering
KB-6160F	135	Filled resin, reduced Z-axis CTE (~3.8%)	High-reliability multilayer boards
KB-6160LC	135	Low CTE via resin chemistry (not fillers)	Boards where maintaining low Dk is also a priority
KB-6165	150	Mid-high Tg, improved thermal stability	Telecom, servers, lead-free reflow
KB-6167	170	High Tg, low Z-axis expansion	Automotive, demanding multilayer stackups
KB-616XF	~170	Lead-free capable, excellent heat resistance	Automotive ECUs, high-end computing

The KB-6160 is worth understanding in depth because it’s the most commonly specified Kingboard PCB laminate globally. It meets IPC-4101E/21 specifications, supports glass styles 1080, 2116, 3313, and 7628 prepregs (KB-6060 series), and comes in panel sizes of 37″×49″, 43″×49″, and 41″×47″. Copper options range from 1/3 oz to 3 oz, including both high-temperature elongation (HTE) and reverse-treated copper options.

The KB-6167 steps things up considerably — it’s built to withstand a Tg of 170°C and features notably low Z-axis expansion, which matters enormously in thick multilayer boards where thermal cycling can crack plated through-holes. The UL94 V-0 flammability rating is retained across all these grades.

For applications demanding lead-free soldering compatibility with added thermal headroom, KB-616XF is the grade of choice. It’s widely used in automotive and high-end computing applications where the board sees aggressive temperature profiles during assembly and service.

CEM-1 Kingboard PCB Laminates

CEM-1 laminates use a paper core impregnated with epoxy resin, with outer surface plies of epoxy/glass. Kingboard’s KB-5150 is the flagship CEM-1 product. It offers many of the advantages of full glass laminates at pricing closer to paper-based boards — making it a cost-effective choice for single-sided boards in consumer appliances and cost-sensitive electronics.

One practical advantage of CEM-1 is its punching processability. The paper core punches cleanly, which suits high-volume, single-sided PCB production without the need for routing. CEM-1 is not suitable for multilayer boards, though — the paper core limits via drilling quality and electrical performance in complex stackups.

Property	CEM-1 (KB-5150 Series)	Notes
Inner Core	Paper/epoxy	Lower cost than full glass
Outer Plies	Glass/epoxy	Improved surface finish
Punching	Excellent (45–70°C)	Suitable for mass production
Humidity Resistance	Good	KB-5150H is enhanced variant
Layer Count	Single-sided primarily	Not recommended for multilayer

CEM-3 Kingboard PCB Laminates

CEM-3 is essentially a step up from CEM-1 and a step below full FR-4. The core uses non-woven glass mat (glass felt) impregnated with epoxy, with woven glass plies on both surfaces. This gives CEM-3 better performance than CEM-1 in double-sided applications while maintaining better punching processability than FR-4.

The trade-off compared to FR-4 is thickness accuracy — CEM-3’s glass mat core is structurally looser than woven glass fabric, which means tighter thickness tolerances are harder to maintain. For designs with strict impedance control requirements, FR-4 remains the better choice.

FR-1 and FR-2 Kingboard PCB Laminates

Both FR-1 and FR-2 are paper-based phenolic resin laminates, commonly used for single-sided PCBs in low-cost, low-frequency consumer applications. These materials leave solder-friendly traces and are easy to stamp, making them popular for simple boards in toys, remote controls, and basic household appliances.

The key difference between FR-1 and FR-2 is their Tg value — both sit around 130°C, though FR-2 is slightly more commonly used in modern single-sided consumer electronics due to marginally better moisture resistance. Neither grade is appropriate for lead-free assembly or any application involving sustained elevated temperatures.

Kingboard PCB Surface Finishes Explained

The laminate grade is only half of the material specification. The surface finish applied to the bare copper dictates solderability, shelf life, component compatibility, and environmental compliance. Here’s how the main options compare on Kingboard PCB assemblies:

Surface Finish	Solderable Life	Cost	Best For	Limitations
HASL	12+ months	Low	Through-hole, standard SMT	Uneven surface, not for fine-pitch
Lead-Free HASL	12+ months	Low-medium	RoHS-compliant standard boards	Slightly rougher surface vs. HASL
ENIG	12 months	High	Fine-pitch SMT, BGA, gold wire bonding	Black pad risk if process controlled poorly
Immersion Tin	6–12 months	Medium	Flat surface, press-fit connectors	Tin whisker risk if not stored correctly
Immersion Silver	6–12 months	Medium	Fine-pitch, RF boards	Tarnishes on air exposure — storage critical
OSP	3–6 months	Low	Single-reflow, cost-sensitive production	Limited shelf life, not for rework

HASL remains the most widely used finish on Kingboard PCB production because of its low cost and robust solderability. However, for anything with BGAs, fine-pitch QFPs (0.5 mm pitch and below), or SMD passives smaller than 0402, ENIG’s flat, uniform surface is the professional choice.

Immersion Silver is worth considering for RF and high-frequency boards — it offers excellent electrical conductivity and a flat surface, but requires careful handling to prevent tarnishing. The solderability window of 6 to 12 months means you need to manage your inventory accordingly.

Key Technical Properties of Kingboard PCB Materials

Engineers who’ve been burned by material failures know that the spec sheet matters. Here are the critical parameters to understand when evaluating any Kingboard PCB laminate:

Glass Transition Temperature (Tg)

Tg is the temperature at which the resin transitions from a rigid, glassy state to a softer, rubbery state. Below Tg, the material behaves predictably. Above it, CTE (coefficient of thermal expansion) increases dramatically — especially in the Z-axis — which stresses plated through-holes and can cause barrel cracking. For lead-free assembly (peak reflow temperatures of 245–260°C), specifying a material with Tg ≥ 150°C is generally recommended.

Dielectric Constant (Dk) and Dissipation Factor (Df)

For standard Kingboard FR-4 grades like KB-6160, Dk is approximately 4.3–4.7 at 1 MHz. This is fine for digital boards up to a few hundred MHz, but becomes problematic at GHz-range signal speeds where Dk variation causes impedance discontinuities and Df-driven signal loss. If you’re routing differential pairs above 1 GHz, you’re in high-frequency laminate territory — consider Megtron, Rogers, or PTFE-based materials instead.

Z-Axis CTE

Standard FR-4 has a Z-axis CTE of around 50–70 ppm/°C above Tg. High-Tg grades and filled variants (like KB-6160F) can bring this down significantly. Low Z-axis CTE is critical for boards with small via aspect ratios, dense BGAs, and any design expected to undergo significant thermal cycling in the field.

Moisture Absorption

Standard FR-4 absorbs ≤0.15% moisture at 23°C over 24 hours per IPC-4101. This seems minor, but moisture absorption affects Dk and Df, degrades insulation resistance, and can cause steam-driven delamination during reflow. For high-humidity environments (marine, outdoor, industrial), select enhanced-moisture variants or ensure proper bake-out before assembly.

Kingboard PCB Applications by Industry

The broad portfolio of Kingboard PCB materials means they show up across virtually every electronics segment. Here’s where each grade tends to land in practice:

Industry	Recommended Kingboard Grade	Why
Consumer Electronics	KB-6160, FR-2, CEM-1	Cost-effective, adequate thermal performance
Industrial Controls	KB-6160, KB-6165	Thermal stability, multilayer capability
Automotive	KB-6167, KB-616XF	High Tg, low Z-axis CTE, lead-free compatible
Telecom / Servers	KB-6165, KB-6167	High-layer count, lead-free reflow, signal integrity
Military / Aerospace	KB-6160 (+ special qualification)	Dimensional stability, IPC compliance
LED Lighting	CEM-1, FR-4 standard	Cost efficiency for simpler thermal paths
Power Electronics	High-Tg FR-4 (KB-6167)	Thermal cycling resistance

Automotive is the segment where Kingboard PCB material selection gets the most scrutiny. AEC-Q qualification requirements mean that selecting KB-616XF or KB-6167 is only the starting point — you need to verify extended qualification testing data with Kingboard or your fabricator for safety-critical systems.

How to Choose the Right Kingboard PCB Material

After working with these materials across different design contexts, here’s the practical decision framework most engineers use:

Start with your thermal budget. What is the peak temperature this board will see during assembly? What is the maximum operating temperature in the field? If your reflow profile peaks at 260°C (lead-free SAC305), you need Tg ≥ 150°C — reach for KB-6165 or higher.

Evaluate your layer count and via aspect ratio. Thick multilayer boards (8+ layers) with deep vias benefit from low Z-axis CTE materials like KB-6160F or KB-6167. Standard KB-6160 is adequate for 4–6 layer designs with normal via geometry.

Consider your operating frequency. Standard Kingboard FR-4 works well below 500 MHz. Above that, Dk and Df start to matter. Beyond 2 GHz, you should be evaluating specialty materials rather than any standard FR-4.

Factor in environmental compliance. RoHS/REACH requirements mean lead-free soldering compatibility is increasingly mandatory. Ensure your chosen Kingboard grade carries the appropriate certifications.

Don’t over-specify. KB-6167 is excellent, but if your design is a simple 4-layer industrial control board with standard HASL finish and no lead-free requirement, you’re paying a premium for performance you don’t need. KB-6160 will serve you well.

Certifications and Quality Standards

Kingboard PCB laminates carry a comprehensive set of industry certifications, which is one reason they’re trusted by fabricators worldwide:

• UL94 V-0 — Flame retardancy certification across all FR-4 and CEM grades
• IPC-4101C/E — Qualification and performance specification for base materials
• ISO 9001:2015 — Quality management system
• RoHS / REACH — Environmental compliance for hazardous substances
• CQC — China Quality Certification for domestic market compliance

Certification documents for specific grades are publicly available on the Kingboard Laminates website and are updated regularly as products receive renewals.

Useful Resources for Engineers

The following datasheets, directories, and databases are directly useful when specifying or evaluating Kingboard PCB materials:

• Kingboard Laminates Official Site — www.kblaminates.com — Product portfolio, certificates, and technical documents
• KB-6160 Datasheet (PDF) — AllDatasheet.com – KB-6160 — Full IPC specifications
• PCB Directory – Kingboard Laminates Listing — PCBDirectory.com — Fabricators who stock Kingboard materials
• IPC-4101 Standard — IPC.org — The governing specification for PCB base materials
• UL Product iQ — iq.ul.com — Verify UL certification status by UL file number (Kingboard UL: E123995)
• Kingboard CQC Certificates — kblaminates.com/en/list/57.html — Updated certification list by product and plant

Frequently Asked Questions About Kingboard PCB

Q1: Is Kingboard PCB material equivalent in quality to Shengyi or ITEQ FR-4?

In the standard Tg range, Kingboard KB-6160 is broadly comparable to Shengyi S1141 and ITEQ IT-158 in terms of electrical and mechanical properties. All three meet IPC-4101 requirements. Kingboard tends to be slightly more competitive on price at high volume, while Shengyi is sometimes preferred in North American markets due to supply chain familiarity. For high-Tg applications, compare specific datasheets — grades don’t map 1:1 between manufacturers.

Q2: Can I use Kingboard KB-6160 for lead-free assembly?

Standard KB-6160 has a Tg of 135°C. While many fabricators use it successfully with lead-free SAC305 solder (peak ~260°C), the margin above Tg is narrow. For better reliability, specify KB-6160C (lead-free compatible variant) or upgrade to KB-6165 (Tg 150°C). The right answer depends on your thermal profile, layer count, and reliability target.

Q3: Where can I download Kingboard PCB datasheets?

The official source is www.kblaminates.com. Individual datasheets are also indexed on AllDatasheet.com and PCBDirectory.com. For the KB-6160, the datasheet covers thermal, mechanical, and electrical properties in line with IPC-4101E/21.

Q4: What is the difference between KB-6160 and KB-6167?

Both are FR-4 laminates, but KB-6167 has a significantly higher Tg (170°C vs. 135°C) and substantially lower Z-axis CTE. This makes KB-6167 the appropriate choice for thick multilayer boards, boards undergoing aggressive thermal cycling, or any application where plated through-hole reliability is critical. KB-6160 is the cost-effective general-purpose option; KB-6167 is the reliability-focused upgrade.

Q5: Are Kingboard PCB laminates RoHS compliant?

Yes. Kingboard’s FR-4 and CEM laminate grades comply with RoHS and REACH directives. Halogen-free variants are also available for markets with stricter environmental requirements. Always confirm the specific grade’s compliance documentation from the Kingboard certificate listing before finalizing a BOM for regulated markets.